Free Online Financial & Business Calculators | OmniTally
Fast, accurate, client-side calculators for loan payments, investment returns, retirement savings, taxes, and more—all free and instant.
US 1099 Freelance Tax Calculator
Calculate us 1099 freelance tax with our accurate and easy-to-use tool.
UK Contractor IR35 Calculator
Calculate uk contractor ir35 with our accurate and easy-to-use tool.
Australia Contractor & Sole Trader Tax Calculator
Calculate australia contractor & sole trader tax with our accurate and easy-to-use tool.
US Quarterly Estimated Tax Calculator
Calculate us quarterly estimated tax with our accurate and easy-to-use tool.
How It Works
Select a Calculator
Choose from our collection of financial, conversion, and sizing calculators.
Enter Your Values
Input your numbers and see real-time calculated results instantly in your browser.
Share & Bookmark
Copy the updated URL at any time to save or share your exact calculation inputs.
Why Use Our Calculators?
100% Free
No account creation, downloads, or payment required.
Standard Formulas
Grounded in proven mathematical and financial formulas.
Client-Side Speed
Zero backend delays; computations execute instantaneously.
Mobile Optimized
Responsive layouts tailored for any screen or device.